Cover for door lock assembly

ABSTRACT

A cover for a door lock assembly having a knob assembly and a bolt assembly. The cover has a pair of side plates integral with a front plate and is formed of sheet material such as sheet steel. The cover is rigidly secured to the door and has an opening for receiving the bolt assembly and a pair of openings for receiving the knob assembly.

I United States Pate t 1151 3,666,309 Zarzycki 1 y 30, 1972 54] COVERFOR DGOR LOCK ASSELY 576,531 2/1897 Anderson ..70/3ss 950,926 3/1910Keil ..70/452 [72] Inventor. Vincent F. Zarzyclu, 9427 Klrkwood St.,963,450 7/1910 Lowe. 292/337 phlladelphla 9114 1,483,333 2/1924 Capece..70/452 [22] Filed: Oct. 13, 1969 2,200,387 5/1940 Erath ..292/337 X PP865,766 Primary ExaminerGeorge F. Mautz Assistant Examiner-Edward J.McCarthy 52 us. 01 ..292/337 Kimmelma and [51 Int. Cl ..E05b 9/04 57ABSTRACT [58] Field of Search ..292/337, 356, 357, 1; 70/451, 1

70 452 443 331 450; 1 131 2 A cover for a door lock assembly having aknob assembly and a bolt assembly. The cover has a pair of side platesintegral 56] References (med with a front plate and is formed of sheetmaterial such as sheet steel. The cover is rigidly secured to the doorand has an open- UNITED STATES PATENTS ing for receiving the boltassembly and a pair of openings for receiving the knob assembly. 926,3366/1909 Keil ..70/452 3,220,231 1 1/1965 Wilson ..70/451 X 3 Claim, 6Drawing Figures PATENTEDMAY 3 0 I972 sum 10F INVENTOR V/NCENT ZARZYCK/ A7'TORNEYS.

PATENTEDHAYSO I972 33. 666.309

A T TOR/V5 VS.

COVER FOR DOOR LOCK ASSEMBLY BACKGROUND OF THE INVENTION 1. Field of theInvention This invention relates to the field of art of guards for doorlocks.

2. Prior Art In widely used door lock assemblies a tumbler barrel islocated within the door knob. In order to open the door a key isinserted into the tumbler and by turning the key or the knob thelatching bolt is actuated to open the door. Such types of lockassemblies have become widely used in inside and outside doors as theyare usually less costly than look assemblies having a separate dead boltand a latching bolt. However, these lock assemblies have caused problemsof longitudinal splitting of the door panel and cracking or splitting ofthe wood between the latching bolt and the door sides. Such doorsplitting has been caused by a force applied to the latching bolt whenthe door is forcefully pushed when the bolt is engaged.

SUMMARY OF THE INVENTION A cover for a door lock assembly having a knobassembly and a bolt assembly. The cover is formed of sheet materialhaving plates integral with a front plate. The front plate has anopening for receiving the bolt assembly and each of the side plates hasan opening cooperating with an opening in the door which receives theknob assembly. The lock cover is rigidly secured to the door to protectthe door from damage resulting from force applied to the bolt assembly.

In the method of installation, an opening is formed in the door for theknob assembly and another opening is formed for the bolt assembly. Thedoor is covered adjacent these openings with a one piece lock coverhaving openings cooperating with the knob assembly opening and the boltassembly opening. The covering is then rigidly secured in place.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a doorcarrying the lock cover of the present invention;

FIGS. 2 and 3 show the lock cover of FIG. 1 in more detail;

FIG. 4 illustrates another embodiment of the invention in which materialis removed from the door; and

FIGS. 5 and 6 illustrate in detail another embodiment of the inventionin which a single slot is formed to receive the lock assembly.

Referring now to FIGS. 1-3 there is shown an outside door 10 having alock assembly 11 installed therein. Lock assembly 11 includes a frontdoor knob 12 having a key hole opening 13, a front door rose 14, and arear door knob and rose (not shown). Lock assembly 11 is commonly calleda cylindrical lock assembly or a key-in-the-knob lock. When a key isinserted in opening 13 it engages a tumbler barrel (not shown) and byturning the key or the knob, latching bolt 15 is actuated. Bolt 15 ispart of a bolt assembly 21 which is horizontally disposed in opening 18of door 10. Rose 14 covers one type of conventional cylindrical lockclamping assembly comprising a pair of clamping members having lips.

In the installation of lock assembly 11 as particularly shown in FIG. 3,an opening is drilled through door 10 from front side 16 to rear side17. Opening 18 for the lock assembly is then drilled from front edge 19of door 10 until it meets opening 20. In order to install the door lockcover of the present invention, door edge is mortised with recesses 22and 23 at a depth equal to the thickness of cover 25.

Cover 25 is formed of a single sheet of material, preferably metal toform a front plate 26 and side or cover plates 27 and 28. Side plates 27and 28 have openings 30 and 31 respectively formed therein whichcooperate with opening 20 when lock cover or guard 25 is fixed inposition. Front plate 26 has a rectangular opening 33 which receives afront face plate member 34 of bolt assembly 21 which is mortised in dooredge 19 by recess 36. The depth of recess 36 is approximately half thethickness of plate 34 so that the outer edge of plate 34 is flush withthe outer edge of plate 26.

As shown in FIG. 2, cover 25 is secured in place by wood screws 37-39which pass through openings 40-42 in side plate 27 and threadedly engageside 16 of door 10. Side plate 28 has similar openings (not shown) forreceiving wood screws which engage side 17. In order to further securelock cover 25, front plate 26 has openings 44 and 45 for receiving woodscrews 47 and 48 respectively which engage door edge 19.

In the method of installation, the openings 18 and 20 are first formedby drilling and the cover 25 is fixed in position by the respective woodscrews. The lock assembly 21 and the knob assembly which includes theroses and knobs are then installed in position. Specifically, the flatouter surfaces of side plates 27 and 28 adjacent openings 30 and 31receive lips of the clamping members. The clamping members are tightenedonto the side plates and in this way secure the knob assembly in placewith a portion of the clamping assembly extending through door opening20.

Thus with cover 25 secured in position, edge 19, cover 25 and plate 34are flush and lock assembly 11 is mechanically protected. As the door ispushed, a force normal to the longitudinal axis of bolt 15 istransmitted by way of plate 34 and the vertical edge of cover opening 33to front plate 26 of cover 25. In this manner such force is received byplate 26 which is reinforced by side plates 27 and 28. Thus thesubstantially strong lock cover 25 receives the force rather than therelatively thin and fragile wood door portions 50 and 51 which are oneither side of bolt assembly 21. In this way, upon application of a highvalue force the wood portions are not broken. In addition, without cover25 the force would have the effect of separating wood portions 50 and 51thereby cracking or splitting the edge 19 of door 10 along alongitudinal line at the edge center.

An additional advantage of the present invention is that since plate 26covers and effectively hides wood portions 50 and 51, any damage tothese portions during installation of assembly 11 does not mar theattractiveness of the door. Since the clamping assembly lips abut andonly frictionally connect to side plates 27a and 28, lock assembly 11may easily be removed for service without removing cover 25.

As an alternative method of installation in accordance with theinvention, instead of centering and drilling opening 18, FIG. 3 anopening 55 may be formed by sawing, for example, from edge 19 to opening20 as shown in FIG. 4. In this manner there is avoided the necessity ofactually drilling opening 18 in the exact center of edge 19 whichrequires a skilled craftsman. Alternatively, opening 18 may be drilledand if not properly done opening 55 may then be sawed. It will be seenthat opening 55 comprises parallel, horizontal plane walls 56 and 57which are spaced apart a distance greater than the vertical height ofbolt assembly 21. In the door of FIG. 4, recesses 22 and 23 are providedand for ease of installation the opening to receive plate 34 is formedof horizontal recesses 58 and 59 which extend between door sides 16 and17. As in FIG. 3 the depth of recesses 58 and 59 is approximately halfthe thickness of plate 34 so that the outer edge of plate 34 is flushwith the outer edge of plate 26. In this manner lock assembly 11 may beeasily installed in openings 20 and 55 of FIG. 4 and the open spacingsbetween plate 34 and sides 16 and 17 are covered by front plate 26.

Referring now to FIGS. 5 and 6 there is shown a simple method ofinstallation of a lock assembly known as Quick Set made by Quick SetCompany, 516 East Santa Anna Street, Anaheim, California. By the use oflock cover 25a of the present invention, the Quick Set lock assembly maybe installed without drilling any holes. Specifically, opening 55 ofFIG. 4 is extended from edge 19a toward the rear of door 10a to formslot opening 55a having upper and lower flat parallel, horizontal walls56a and 57a respectively. Openings 5611-570 may be formed for example bysawing door 10a and are spaced apart a sufiicient distance to receivethe rectangular shaped Quick Set lock assembly. Cover 25a is fixed inposition in the manner previously described by screws 37a, 39a, 47a, and48a for example. After that, the lock assembly (not shown) is insertedin opening 55a and plate 34a fixed in position in recesses 58a and 59a.The rose 14a and knob assembly 12a are then placed in position on doorside 16a with similar parts being assembled on door side 17a.

In the Quick Set cylindrical lock assembly, rose 14a and the opposingrose on door side 17a each have conventional clamping lips and theseroses themselves comprise the clamping members which are then tightenedon the cover 25a. It will be understood that side plate openings 30(30a) and 31 (310) are of magnitude to pass through most of the clampingassembly but of magnitude small enough to form the adjacent surfacesabutting the clamping member lips.

It will be understood that door lock covers or guards 25 and 250 may beshaped in different decorative forms as for example, in the roundedshape, shown in FIGS. 1-3 or the more rectangular shape, shown in FIGS.and 6. it will be understood that with a solid door, shown in FIGS. 1-3,opening 41 may extend to the rear of cover 25 remote from front plate 26while in a hollow door, openings 40a and 42a are positioned to engagethe solid portion of the door which extends from edge 190 a conventionaldistance. In addition, covers 25 and 250 may be made of suitablematerial such as cold rolled steel and may be one-sixteenth of an inchin thickness, for example.

What is claimed is:

l. A cover for a cylindrical lock mounted in a door, said cylindricallock having a bolt assembly and a knob assembly, said knob assemblyincluding a clamping assembly having a pair of clamping members havinglips, said bolt assembly including a face plate with outer edges andhaving an opening for a bolt, comprising a pair of side plates integralwith a front plate formed of sheet material, said side plates eachhaving completely flat outer surfaces and having no keyhole openings,said side and front plates having substantially equal and constanttransverse dimensions,

said front plate including a front surface having an interruption, saidinterruption being substantially equal in dimension to the dimension ofthe outer edges of said face plate for receiving said face plate in saidinterruption and in flush relationship with said front surface,

each of said side plates having an opening cooperating with an openingin said door,

said flat outer surfaces of said side plates adjacent said side plateopenings for receiving said lips of said clamping members which membersare adapted to be tightened onto said side plates thereby to secure saidknob assembly in place with a portion of said clamping assemblyextending through said door, said clamping member lips abutting and onlyfrictionally connected to said side plates,

each of said side plate openings being of magnitude large enough toreceive and pass through most of said clamping assembly and of magnitudesmall enough to form said adjacent surfaces abutting said clampingmember lips, and

means for rigidly securing said lock cover to said door to protect saiddoor from damage resulting from force applied to said bolt.

2. The lock cover of claim 1 in which said front and side plates areformed of a single piece of sheet metal.

3. The lock cover of claim 1 in which there are provided additionalopenings in said front and side plates for receiving fastening membersto secure said lock cover to said door.

1. A cover for a cylindrical lock mounted in a door, said cylindricallock having a bolt assembly and a knob assembly, said knob assemblyincluding a clamping assembly having a pair of clamping members havinglips, said bolt assembly including a face plate with outer edges andhaving an opening for a bolt, comprising a pair of side plates integralwith a front plate formed of sheet material, said side plates eachhaving completely flat outer surfaces and having no keyhole openings,said side and front plates having substantially equal and constanttransverse dimensions, said front plate including a front surface havingan interruption, said interruption being substantially equal indimension to the dimension of the outer edges of said face plate forreceiving said face plate in said interruption and in flush relationshipwith said front surface, each of said side plates having an openingcooperating with an opening in said door, said flat outer surfaces ofsaid side plates adjacent said side plate openings for receiving saidlips of said clamping members which members are adapted to be tightenedonto said side plates tHereby to secure said knob assembly in place witha portion of said clamping assembly extending through said door, saidclamping member lips abutting and only frictionally connected to saidside plates, each of said side plate openings being of magnitude largeenough to receive and pass through most of said clamping assembly and ofmagnitude small enough to form said adjacent surfaces abutting saidclamping member lips, and means for rigidly securing said lock cover tosaid door to protect said door from damage resulting from force appliedto said bolt.
 2. The lock cover of claim 1 in which said front and sideplates are formed of a single piece of sheet metal.
 3. The lock cover ofclaim 1 in which there are provided additional openings in said frontand side plates for receiving fastening members to secure said lockcover to said door.